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<base href="https://bugs.freedesktop.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL][v4.3 regression]SKL OpenCL performance reduced hugely"
href="https://bugs.freedesktop.org/show_bug.cgi?id=92975">92975</a>
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<th>Summary</th>
<td>[SKL][v4.3 regression]SKL OpenCL performance reduced hugely
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>XOrg git
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>Linux (All)
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>critical
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Intel
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>mengmeng.meng@intel.com
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
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<pre>==Regression==
--------------------------
Regression: Yes
Ubuntu: 14.04
==kernel==
--------------------------
bad commit: v4.3-rc1
good commit: v4.2.6
==Test cases==
OpenCV: git://code.opencv.org/opencv.git
OpenCL 1.2 Code Samples:
<a href="https://software.intel.com/en-us/intel-opencl-support/code-samples">https://software.intel.com/en-us/intel-opencl-support/code-samples</a>
Luxmark v2.1: <a href="http://www.luxrender.net/wiki/LuxMark">http://www.luxrender.net/wiki/LuxMark</a>
==Bug detailed description==
Compared kernel v4.3 v.s. v4.1, many OpenCL performance (e.g. OpenCV 3.0,
Luxmark v2.1) reduced hugely(>50%) on SKL. The issue can't be reproduced on
BDW.
I can't find out the first bad commit because SKL can't boot with some bisected
kernels.
==Reproduce steps==
----------------------------
./luxmark --scene=SALA --mode=BENCHMARK_OCL_GPU --single-run (Luxmark v2.1
SALA)</pre>
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